US researchers are creating images in free space without using holograms. Instead, the team from Brigham Young University have created something like a 3D printer for the air. It uses a laser to trap a tiny particle of cellulose using spherical and astigmatic optical aberrations – a photophoretic particle trap – and then the same ...
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from Electronics Weekly https://www.electronicsweekly.com/news/research-news/look-no-holograms-still-moving-image-floats-space-2018-01/
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